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If you replace your engine with one that is not exactly the same year or displacement you are asking for problems. The manufacturers are constantly improving performance and efficiency by changing parameters in the computer controlled engine management systems. It will be different for every year and engine size, thus using the computer from say a '91 3.4L to control a '91 3.8L could cause a rich condition or some other issue, timing or high idle, etc.

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โˆ™ 2006-09-09 14:37:36
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Q: Can you replace a 3.4L engine with a 3.8L engine on a 99 grand am gt?
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